Steam-generator



(No Model.)

T. ORANEY.

STEAM GENERATOR.

Patented June 29, 1886.

' tion on line w a", in Fig. 1.

m Unrrnn STATES PATENT @rrrcn.

THOMAS GRANEY, OF BAY CITY, MICHIGAN.

STEAM-GENERATOR.

ZEPECIFICATION forming part of Letters Patent No. 344,635, dated June29, 1886.

Application filed October 29, 1885. Serial No. 181,257.

To aZZ whom it may concern:

Be it known that I, THOMAS CRANEY, of Bay City, in the county of Bay andState of Michigan, have invented new and useful I1nprovements inSteam-Generators, and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, which form a part of this specification.

This invention relates to a new and useful improvement insteam-generators; and the invention consists in the peculiar arrangementof a series of circulatingpipes in connection with a steam-boiler of theusual kind, whereby two objects are gained-one, to increase theeffective heating-surfaces, and the other to gain proper supports for afire-arch and combustion-chamber, all as more fully hereinafterdescribed, and set forth in the claims;

In the drawings which accompany this specification, Figure 1 is a sideelevation of my improved generator, with the brick set-' ting partiallyremoved. Fig. 2 is a crosssec- Fig. 3 is a crosssection on line y y inFig. 1.

A is a steam-generator of the ordinary kind, set in the usual manner. 13is a circulatingpipe connecting with the boiler near the rear end belowthe water line, thence passing downward and forward along the side wallof the boiler, terminating at the front wall of the furnace-chamber G,which latter is placed in in front of the boiler. The opposite side ofthe boiler is provided with a similar pipe.

D is another circulating-pipe connecting with the boiler near the frontand below the water-line, thence passing downward to the height of thetop of the furnace-chamber, and then forward along the side wall of theboiler, terminating in the front wall of the combustion-chamber. Theopposite side of the boiler is provided with a similar pipe E and F areconnecting-pipes between the pipes D on one side and the pipes B on theother side, and forming the sides and top of the furnace-chamber. Thefurnace-chamber itself is provided with a so-called fire-arch, G, whichis supported upon the pipes E F in any desired manner, and above thisfire-arch (No model.)

air-heating lines are arranged,which form part of a system of smokelesscombustion, which I intend to arrange in connection with my improvement,but which does not form a necessary part thereof. The side walls of thefurnace-chamber are preferably built outside and between the pipes E F.

The difficulty of constructing a fire-arch in connection with asteamgenerator is well understood. It is almost impossible to keep it inplace for any length of time, or prevent it from injuring the side wallsof the furnacechamber by its expansion and contraction under theinfluences of the heat. The obvious Way to steady this arch would be togive it considerable height; but this is inadmissiblein connection witha boiler-furnace, as its greater height would make it an obstruction,besides giving the furnace an undesirable elevation in the center, whichwould require the setting of the grate at a low height, or the settingof the boiler at an inconvenient elevation.

In my improvement the fire-arch can be built level. It is well supportedand can never slip or work down or create injury to the adjoining walls,and the pipes which sup port it form a part of a very effectivecirculating system, which greatly adds to the steam-generating power ofthe generator, as they receive a large amount of the waste heat expendedupon'the walls of the furnace.

If desired, the furnace may be constructed as well under the boiler; butI consider the increased gain in heatingsurface on the un der side ofthe boiler to more than compensate any other loss.

The pipes D and B are provided at their free ends with removable plates,for the purpose of cleaning.

What I claim as my invent-ion is 1. In a steam-generator, thecirculating pipes B D, arranged one above the other on the sides of theboiler and having interconnecting pipes E F, forming the sides and topof the furnace-chamber, substantially as described. v

2. In a steam-generator, the circulatingpipes B, connecting with theboiler near the rear and terminating at the front wall of thefurnace-chamber, and the circulating-pipes D, connecting with the boilernear the front support for the fireareh, substantially as deandterminating at the front Wall of said furscribed.

nace-ehaniber at the top thereof in combi- 1 nation with the pipes E F,connecting the THOMAS GRANEY' 5 pipes B on one side of theboiler withthe Witnesses:

pipes D 011 the other side, and forming the H. S. SPRAGUE,

sides and top of the furnace-chamber and a OHARLEs J. HUNT.

